Table 1.

"True" rotational variance between femur (transepicondylar axis) and different tibial landmarks: medial border or medial third.

"true" rotational variance	medial border	medial third
median	17.4°	-1.6°
range	-13.8° to 32.9°	-24.1° to 15.9°	p < 0.001
≤ ± 5°	4%	68%
≤ ± 10°	15%	85%
≤ ± 20°	69%	98%

Negative values indicate femoral external rotation relative to the tibia, positive values indicate relative femoral internal rotation.